Contkol fob variable radio tuning units



April 23, 1929. v, HEDSTRQM 1,710,539

. CONTROL FOR VARIABLE RADIO TUNING UNITS Filed Feb. 5, 1925 grwuxtoz 6'- K Hedalram,

Fatented Apr. 23, 1929 inane GUSTAV HEDSTROM, 0F KENOSHA, WISCONSIN.

CONTROL FOR VARIABLE RADIO TUNING UNITS.

Application filed. February This invention relates to radio receiving sets, and more particularly to variable tuninn units thereof.

The invention has for one of its ohie its the gn'ovision of novel and simple means through the medium of which all of the variable tun inn; units ot a may he simultanoously adjusted or rotmed trom a single or nnister urthcr oh 'on oi which snail he units to he ,5 ed with the which shali units to he invention is the character stated nit the tuning "-ous r ustcd or relatn oit play or lost motioi'i, l to crmit the tuning rotated through a arc m-catcr than J", and oh shall he i permit t to 'cd to he to formly and smoothly adji i i ith the above and choir v the invention con ts oi? the combination and ii rangcmcnt of parts here; Emitter"telly d s=-scrihcd and claimed, and illltttied ill the zirconil'ianying dPauling wherein: l

l igi ure l a top plan view of a :l rag nr-n :iry portion ot a radio rcceivi set ilusg" the u uilication oi" my mvcntion to a h creel} and 3 detail view in side elevation dram gr, hy simila Correspondin to in the ikillmvzngg dos i on n 7 "once characters.

in the d:uwinsg; 'l and Pdesignate the andfl the panel of a radio retuning; unitsi and l are ype and are our izeh may e made oi? met U vial and which the tunin is onto;

ly beyond the panel and i outer end of this shatt which is in the prosv sh it ii in: uuncc V A as :1 master control pretera'nly in the orin of? a nnoh S.

In accordance with my inx' ention the and T are so connected that when the .cr control 8 is turned, the tm'iii'ig units 1 and 1 are simultaneously turned to equal degree. This connection:isestahiished by similar angle levers 9 and .10 secured respectively'to the shafts 6 and 7, a link 11 se- 5, 1925. Serial No. 7,188.

cured to the outer arm 9 ot the lever 9 and the inner arm 10 oi the lever 10, and a link 12 secured to the inner arm 9 of the lever 9 and the outer arm 10 oi the lever 10. The links 11 and 12 arcprovided with arms l1 and 11 and arms 12 and 12 rcspectivoly which are pivotally connected at their outer or free ends to the outer or free ends of the arms of the levers 9 and 10. The arms of each. link are arranged at a similar inclination with respect thereto, and the links are secured to the lovers 9' and 10 with their arms extending in opposite directions. The ;;le lovers 9 and 10 are provided With openinns i" and i0, resymctively, to permit them to be mounted on the shafts (3 and 7, and are lined to the Shaft/S by set screws 9 and 10, respectively. 7

Although only a pair of varial'ile tuning units are shown connected for simultaneous adjustment or rotation, it is to be understood that a greater munher may be so connected and this may be done by increasino; the length of the links 11 and 12 and providing them With additional. arms.

From theioregoing description, taken in connection with the accompanying drawing, it? will be apparent that l have provided a device through the medium of which the vuriahle tuning units of a radio receiving set may he simuitaneously adjusted or turned thrmigrh the medium a master control, and that the device is simple and easy of application.

While I have described the principle of operation of the device, together with What now consider to he the best embodiment thcreot ll desire to have it understood that the st ructure shown is merely illustrative and that such changes may he made therein as fall within the/scope of the following claim.

v What is claimed is:

In combination, number oi? tuning units including shafts, a lever connected to the 1 iatt of each unit and having angularly reted arms, a link having inclined arms pivted to corresponding; arms of the levers, and second link having arms inclined oppositely to the arms of the first link and pivoted to the other arms oi: the levers, the lever arms occupying a position at one side of the shafts and the linksoccupying a position at the opposite side of the shafts in one adjusted position of the tuning unit.

In testimony whereof I atiix my signature. 

